Crank-shaft hanger



(N0 Model.)

H. BRENNAN.

CRANK SHAFT HANGER.

593562 Patented Nov. 16,1897.

I l a A 7 I 9166 426 (T 1 t Q f r i A C7271 p -/Z WITNESSES:

A BY W M W9W K ATTORNEYS.

ArnNr i PATRICK H. BRENNAN, OF SYRACUSE, NEW'YORK.

CRAN K -SHAFT HANG ER.

SPECIFICATION forming part of Letters Patent No. 593,562, dated November 16, 1897. Application filed August 26, 1896. Serial No. 604,001. (No model.)

To aZZ whom it-maty concern:

Be it known that I, PATRICK H. BRENNAN, of Syracuse,- in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Crank-Shaft Hangers for Cycles and Crank-Shafts Consisting of Interlocking Sections, of which the following, taken in connection with the accompanying drawings, is a fulLclear, and exact description.

My invention relates to cycles, and particularly to crank-shaft hangers therefor and to crank-shafts consisting of interlockingsections. 4

My object is to produce an improved crankshaft hanger for cycles comprising a rotatable sleeve in which. the crank-shaft is secured, said sleeve being journale'd in suitable ballbearings in the barrel of the hanger.

My further object is to provide a sectional or divided crank-shaft having the inner ends of the sections provided with means for in terlockin g, comprising scarfs and angular undercuts creating interior angles and points, in such manner that a scarfed point on one section enters the angular undercut of the other to lock them together to rotate as one piece. A further object relates to the mountin g of said shaft-sections in said sleeve in such manner that when they are locked together neither of the sections nor the entire shaft can be rotated in the sleeve, nor can the rotation of one section or the operation of either crank operate to draw said sections inward until they become interlocked or to separate them until they are released from each other, but at any time the sleeve can be revolved around said shaft-sections to draw one of them in frolnits position when simply in partial engagement with the other until both are interlocked. One of the shaft-sections has no longitudinal movement in said sleeve, while the other section is reciprocated therein by the rotation of said sleeveto lockit into the other or for its removal from said sleeve,means being provided whereby what maybe termed the stationary section can be detached and removed from said sleeve at any time independently of the other section, as that is also removable independently by the rotation of said sleeve. Either shaft-section is also removable independent of the ball-bearings of said sleeve. For these purposes one shaftsection is removed the rotation of the threaded section or the revolving of the sleeve around it will screw said section into or out of said sleeve; or when bothsections are partially engaged, the keyed section being in place, then the rotation of the sleeve will draw said threaded section inward until the sections are locked together, ora reversal of said sleeve will screw the threaded section out and lock said section's.

It is constructed as follows, reference being had to the accompanying drawings, in which- Figure 1 is a vertical section of the hanger complete. Fig. 2 is a crosssection on line m 00. Fig. 3 is an elevation of the crank-shaft sections detached and separated as ready to be inserted into the sleeve.

A is thebarrel of a pedal-shaft hanger, into which the inner ball-races or cones 2 are suitably inserted. A sleeve 3, provided with cones 4, is mounted within said barrel and is rotatable upon the balls 5. Flanged nuts 6 are screwed onto the barrel, operating both to retain the cones 2 and also as dust-rings to ex,- clude dust from the ball-bearin gs. A crankshaft consisting of sections a and b is mounted in said sleeve, the section at being threaded to screw into it and the section I) being connected to it by means of the groove 7 around this section, and the tangential pin or pins 8, inserted through the sleeve and having a bearing in said section to permit the sleeve to be rotated or revolved around this section. To aid in such revolution, one end ofthe sleeve is shown as finished off as a nut to permit the use of a wrench; butit is obvious that said sleeve can be revolved by other means. The meeting ends of said shaft-sections are provided with meeting surfaces the planes of which are upon lines more or less angular or inclined to the axis of said shaft, as bya scarf 9 creating the plane 11 and an undercut cre- ICO ating the point 12, the planes 13 and 14 and entering angle 15 at their intersection. I do not, however, limit myself to the precise number of said planes or of the angles thereby created. The planes, points, and angles of each section are counterparts, so that the point of one enters the angle of the other, and all of the planes of one coincide and fit upon the planes of the other to create a closely and tightly interlocking joint. The blunted ends of the points permit the taking up of wear and also prevent the forcing of sharp points into the apices of said angles, tending to cut in and start a split; also, the longitudinal wedging of the points into said angles will more or less expand the points 16 into close frictional contact with the interior of said sleeve and aid in the propulsion of said sleeve and the driving-sprocket 17 by means of the pedal-cranks 18, one of which is secured to or integral with each shaft-section. It will be seen that the sleeve can be rotated around both sections, as shown in Fig. 1, to screw the section at out for removal, the section b not changing its position; that when the section a is inserted into the sleeve far enough to engage its thread, and also to partially engage with the other section, then the rotation of the sleeve will draw section a in until it becomes fully interlocked with the section 1); also that by removing the keys 8 the section b can be removed at any time independent of the section a and can be reinserted and rekeyed, all without moving the section a. It Will be further seen that by the elongation of the meeting surfaces of the joint connecting the shaft-sections the meeting planes are enlarged, their frictional contact increased, the joint made is stronger and more perfect, and by the alternation of a scarf and an entering angle and point on each section the sections are locked together better, the torsional strain on the sections has much less tendency to exert a longitudinal force upon either or both sections to tend to separate them, and both sections are expanded into close frictional contact and positive engagement with the interior of the sleeve.

What I claim as my invention, and desire to secure by Letters Patent, is.

1. The combination with a sleeve, of a crank-shaft comprising two sections, each provided upon its inner end with a scarf and an angular undercut creating a point on each to enter the angle upon the other, one section being held in said sleeve against longitudinal movement in said sleeve, and the second section being adapted to be entered into said sleeve and to be thereafter shifted longitudinally by the rotation of said sleeve, to bring said scarf and angle-joint members into full engagement to lock said sections together, or to separate and disengage them.

2. The combination with a sleeve, of a crank-shaft comprising two sections each provided upon its inner end with a joint member comprising a point created by cutting a scarf and a face in angularly-intersecting planes, and an undercut plane intersecting said face and creating an entering angle, one

of said sections being rotatable in said sleeve but not longitudinally movable therein, and the other being threaded exteriorly and adapted to be screwed into said sleeve to bring the joint members into full engagement, or unscrewed therefrom to disengage said joint members, all by the rotation of said sleeve around both shaft-sections.

In witness whereof I have hereunto set my hand this 24th day of August, 1896.

PATRICK H. BRENNAN. In presence of CHARLES W. MARVIN, HOWARD P. DENISON. 

